Question: What is the etymology of the CNO cycle that has a date of discovery as 1772-0-0?
Paraphrase: What is the etymology of the CNO cycle that has a date of discovery as 1772-0-0?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q222971 wdt:P138 ?answer . ?answer wdt:P575 ?x FILTER(contains(YEAR(?x),'1772'))}
Answer: nitrogen